The R9 V3 is less than half the price of the La Prima and scores higher on our rubric, the entry-tier value benchmark that competes with far pricier hardware. The La Prima gives you 3 Nm more and Asetek's industrial build, but at more than double the cost.
So the La Prima only makes sense if Asetek's engineering and the extra torque justify the premium for you. For most buyers, the R9 V3 gets you most of the everyday experience for a fraction of the outlay, with a coherent upgrade path above it.